What number multiplied by itself 2 times equals 1/100

At the many chips cookie company they are serious about the number of chocolate chips in their cookies they claim that each cookie hasn't c chips. if their claim is true there will be 200 chips in 10 cookies

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up